Hass.io, Spotify and Chromecast

Hi,

I am struggling for quite a while now, that I am unable to send a Spotify track or playlist in Hass.io to my chromecast. I’ve read all kind of posts, tested all kind of configs, but I can’t get it to work. I am able to send radio streams to my chromecasts.

An example:
image

Essentially nothing happens.

Help is very welcome